9 Scientific, optical, weighing, measuring, checking (supervision) apparatus and instruments, namely, electronic landing gear controls, fire extinguishers, solenoid valves, solenoid assemblies, servomechanisms, namely, controlled volume electrical pumps, test beds for these servomechanisms, micro-processor based electronic controllers for aircraft engines; apparatus and instruments for the recording, transmission, reproduction, reception, retrieval or processing of data, sound or images limited to use in the aeronautical field; calculation and operating software for simulation, running and storage of test programs; electrical and electronic devices and equipment for maintenance and monitoring on board aircraft or engines, fixed on test benches or portable for ground interventions for reading out and interpreting data from computers and sensors; data processing equipment and computers; equipment for data processing and computers; recorded computer programs containing information about aircraft engines, operation, repair, overhaul, servicing, maintenance and reconditioning of engines, modules and parts of aircraft engines; blank magnetic, optical and digital recording media, CD-ROMs, DVDs limited to use in the aeronautical field; downloadable data banks containing information about aircraft engines, operation, repair, overhaul, servicing, maintenance and reconditioning of engines, modules and parts of aircraft engines; apparatus for industrial endoscopy not for medical purposes and component parts thereof, namely, endoscopes, horoscopes, rigid endoscopes, flexible endoscopes, fiberscopes, video endoscopes, video probes, cameras, electric light generators, connection cables, video monitors, image acquisition apparatus limited to use in the aeronautical field and more specifically for the observation of industrial machine canalization, apparatus for inlaying text in images limited to use in the aeronautical field in the nature of computer hardware for entering text into digital images; and image processing apparatus limited to use in the aeronautical field